On Sat, 2011-04-23 at 06:57 -0400, Mark Wendt (Contractor) wrote:
> On 4/22/2011 5:26 PM, Robert Pabon wrote:
> > Man my head is starting to spin! No wonder people just go with steppers and
> > call it a day. Maybe my vision is clouded by ignorance but it doesn't seem
> > like it should be that hard to pick up a brushless DC motor, a suitable amp
> > and make it work. Obviously it would be easier to just buy a sorted
> > motor/driver, but then it would be easier to buy a sorted CNC machine as
> > well.
> >
> > So getting back to the motor amp combination for a second someone have a
> > look at hese for a minute and tell me what you think.
> >
> > This is the motor I am using:
> >
> > http://www.servodynamics.com/Drawing/23S-IE.pdf
> >
> > I am using the IG23CS-64-IE2000-S
> >
> > Servo dynamics recommends the 1224-BLS driver for this motor. The 1224BL
> > is the comparable amp:
> >
> > http://www.servodynamics.com/Specs/1224bl_spec.pdf
> >
> > And here are the amps I was looking at using:
> >
> > http://www.a-m-c.com/download/datasheet/bd30a8.pdf
> >
> > Servo dynamics says I am fine driving with either sinusoidal or
> > trapezoidal. The AMC is trapezoidal. Obviously need to add a filter card,
> > but otherwise it looks to be in the ballpark. Opinions?
>
>
> Okay, I'm getting a bit overwhelmed here too. I'm currently using
> steppers on my saw beveler, but have future thoughts of upgrading to a
> servo based system. So, if what Robert shows as necessary, for one axis
> I'd need a servo, an amp, a driver, a bunch of cards for the pc end of
> the affair, an O scope, tons of other test equipment...
>
> Have I left anything out? ;-)
>
> I'm really beginning to wonder if it's worth the expense.
>
> Mark
Single channel servo (clone as necessary):
---------------------< power_supply
|
emc -> motion_card -> servo_amp -> motor ( dc | ac )
| |
-------------------< encoder
For dc servos it is nice to have a tach for velocity feedback although
cradek has demonstrated a nice way around that.
This usually gets you several things; increased speed, freedom from
mid-band resonance, usually lots of I/O for limit switches and probably
more attributes I cannot recall at present (too early in the morning).
Setting up a servo is not as daunting as one might think. It does help
to put a channel on the bench and learn about it while it is not
connected to an axis ( less stuff to damage if it does something
unexpected). ;-)
I would never connected a servo to a real machine without having e-stop
limit switches in place and tested. Please don't ask why I think this
is important.
Halscope is invaluable once you start on the real machine. Thanks
JMK! :-)
HTH
Dave
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